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Transcription and Regulation

Transcription and Regulation
Transcription factors are

proteins which bind to DNA and regulate transcription
CATT boxes
promoters
TATA boxes

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Transcription and Regulation
Each tRNA molecule has a cloverleaf secondary structure consisting of

three stem loops
two stem loops
four stem loops
either (a) or (b)

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Transcription and Regulation
In prokaryotes, transcription is

terminated by a poly A sequence
terminated by the stop codon
terminated by a start codon
terminated by a protein called rho

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Transcription and Regulation
Transcription by E. coli polymerase occurs in

two phases known as initiation and termination
None of these
three phases known as initiation, elongation and termination
four phases known as initiation, propagation, elongation and termination

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Transcription and Regulation
Rho-dependent termination of transcription in E. coli

both (a) and (b)
requires ATP
requires about 50 nucleotides of uncomplexed mRNA
removes mRNA and holoenzyme from the DNA

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Transcription and Regulation
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

none of these
RNA polymerase III
RNA polymerase I
RNA polymerase II

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